Pete's right about the importance of getting a wheel with safe ratings for all
of the parameters. On an original-equipment wheel, I would not expect to find a lot of information... width, bead style, and even offset are common, but I don't recall seeing a pressure rating on one. Aftermarket wheels may say more, because they are sold without a specific vehicle in mind. Too bad the aftermarket wheel web sites have so little useful information: even a load limit is rare.
truck wheels seem more likely than car wheels to be rated for the 50 PSI inflation pressure of Load Range C tires
, but most egg owners are looking for 13" and 14" wheels, and trucks use bigger stuff.